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@ARTICLE{BussmannHolder:885930,
      author       = {Bussmann-Holder, Annette and Keller, Hugo and Simon, Arndt
                      and Bihlmayer, Gustav and Roleder, Krystian and Szot,
                      Krzysztof},
      title        = {{U}nconventional {C}o-{E}xistence of {I}nsulating
                      {N}ano-{R}egions and {C}onducting {F}ilaments in {R}educed
                      {S}r{T}i{O}3: {M}ode {S}oftening, {L}ocal
                      {P}iezoelectricity, and {M}etallicity},
      journal      = {Crystals},
      volume       = {10},
      number       = {6},
      issn         = {2073-4352},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2020-04186},
      pages        = {437},
      year         = {2020},
      abstract     = {Doped SrTiO3 becomes a metal at extremely low doping
                      concentrations n and is even superconducting at n < 1020
                      cm−3, with the superconducting transition temperature
                      adopting a dome-like shape with increasing carrier
                      concentration. In this paper it is shown within the
                      polarizability model and from first principles calculations
                      that up to a well-defined carrier concentration nc
                      transverse optic mode softening takes place together with
                      polar nano-domain formation, which provides evidence of
                      inhomogeneity and a two-component type behavior with
                      metallicity coexisting with polarity. Beyond this region, a
                      conventional metal is formed where superconductivity as well
                      as mode softening is absent. For n ≤ nc the effective
                      electron-phonon coupling follows the superconducting
                      transition temperature. Effusion measurements, as well as
                      macroscopic and nanoscopic conductivity measurements,
                      indicate that the distribution of oxygen vacancies is local
                      and inhomogeneous, from which it is concluded that
                      metallicity stems from filaments which are embedded in a
                      polar matrix as long as n ≤ nc.},
      cin          = {PGI-1 / IAS-1 / JARA-FIT / JARA-HPC},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000554685500001},
      doi          = {10.3390/cryst10060437},
      url          = {https://juser.fz-juelich.de/record/885930},
}